Hydrogen gas (H2) and oxygen gas (O2) react to form liquid hydrogen peroxide (H2O2). Which statement is true about the reaction?
A.
The atoms of the reactants have combined to form a new substance.
B.
The two gases have mixed together, but a new substance has not formed.
C.
The product that is formed has the same physical properties as the reactants.
D.
The same atoms are present, so the chemical properties are the same.

law of conservation of matter

a boiling water reactor does not boil the water. a pressurized water reactor boils the water faster. a pressurized water reactor is heated directly by the core. a pressurized water reactor does not use fission.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer